18339490 has 16 divisors (see below), whose sum is σ = 35550648. Its totient is φ = 6771456.

The previous prime is 18339437. The next prime is 18339493. The reversal of 18339490 is 9493381.

It can be written as a sum of positive squares in 4 ways, for example, as 9357481 + 8982009 = 3059^2 + 2997^2 .

It is not an unprimeable number, because it can be changed into a prime (18339493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70407 + ... + 70666.

Almost surely, 2^18339490 is an apocalyptic number.

18339490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18339490 is a deficient number, since it is larger than the sum of its proper divisors (17211158).

18339490 is a wasteful number, since it uses less digits than its factorization.

18339490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141093.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 18339490 is about 4282.4630763148. The cubic root of 18339490 is about 263.7115095483.

The spelling of 18339490 in words is "eighteen million, three hundred thirty-nine thousand, four hundred ninety".